Extension of LIS extractor - possible to delta enable field from Z-table?

Hi Experts
We have to get data from a date field in a custom Z-table (delivery related) in R/3 to BW.
We would like to get the date by extending a delivery LIS extractor with a new field and make some ABAP to lookup the correct value in the custom Z-table.
A requirement is though that if the date in Z-table is changed then we need to get the update value to BW. Therefore, we need to delta enable the new field in the append structure - but that ain't possible is it?
Alternatively will we have to make a new DataSource based on the custom Z-table and somekind of full load (with a fake delta).
Thanks.
Kind regards,
Torben

Torben,
If your custom Z-table does not contain too much data and doesn't change too often it might be an option to turn on DB logging (Technical settings -> Log data changes). Do not do this for large tables containing transactional data as the logs will consume a lot of diskspace!
Each insert/mod/deletion will be logged and in in a user-exit you can use FM DBLOG_READ_WITH_STATISTIC to check if something has changed and then append the corresponding data to your data package.
Grtx!
Marco

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